13 Best Secret Cameos In Marvel Movies

8. Jennifer Connolly - Spider-Man: Homecoming

Considering how badly Sony did to keep some of their bigger Homecoming secrets - like Gwyneth Paltrow and Donald Glover's cameos - under wraps, they did well to hide the fact that Jennifer Connolly was set to appear as well.

Thing is, she didn't actually appear. Just like Gary Sinise, her role was limited to a voice-only one as the voice of KAREN, the AI built in to Peter Parker's first Stark-sponsored Spider-Man suit. In taking the role she returned to a Marvel property, having already played Betty Ross in Ang Lee's Hulk.